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I was surprised to notice the following:
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> =((1 or false) and true) or false
1
Same results on 5.1.2 and 5.1.3, MacOS and Windows.
For what it's worth, I observed in lcode.c that the OPR_AND _expression_ inherited the 'k' (kind) of VTRUE from its rhs subexpression, which seems wrong and seems to throw off the subsequent call to luaK_goiffalse().
-bhk